1 Clinic for Otorhinolaryngology and Maxillofacial Surgery, Clinical Center of Serbia, Belgrade, Serbia. 2 Department of Otorhinolaryngology and Maxillofacial Surgery, Faculty of Medicine, University of Belgrade, Belgrade, Serbia. 3 Department of Pharmacology, Clinical Pharmacology and Toxicology, Faculty of Medicine, University of Belgrade, Belgrade, Serbia. 4 Faculty of Medicine, University of Belgrade, Belgrade, Serbia. 5 Clinic of Maxillofacial Surgery, Sechenov University, Moscow, Russia. 6 Hospital for ENT, KBC DragišaMišović, Belgrade, Serbia. 7 General hospital "Djorđe Jovanović", Zrenjanin, Serbia. 8 Division of Nephrology & Hypertension, Mayo Clinic, Rochester, MN, USA. 9 Department of Biostatistics, Medical Faculty, University of Belgrade, Belgrade, Serbia.